Malicious PDF — malware analysis report

Static analysis result for SHA-256 b309372542898b29…

MALICIOUS

PDF

79.8 KB Created: 2021-07-02 00:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10c46f6cc1d010180deca2d0ddbd2043 SHA-1: d2ded4b6fe091784915d688a11a2c460e17aff0a SHA-256: b309372542898b2992a321ca9800c3b6304021401c46f569cc965fd65114dc54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure, likely for phishing or to download further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=red+and+black+plaid+family+photos PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774dc843ff3---58058565733.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/61509877370.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/259520854d0e25cdcfaf536f19ba9e6f/10956299278.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///bakavutuxoj.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pavorarejinekuzade.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8b6040a398fc234002bcb07f4f03e66b/vajulabobegopovalenadimuv.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/54c690a5a5700c016794471151456b2c/bonaforuraragoza.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/rovadipupalupadudomam.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9e89903a---juviz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aeaebdd650bdbcecd4224fc481e82b76/voxakuwubopesudisada.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc895a9bf---sotegutamumota.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16076582112362---panik.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/85802404283.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/n0h106dtfsoh8jh05k7a064227/87615897285.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/josot.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jd3qaan8gu0ha5otsonvp9mcm0/safususetix.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/71361830255.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bd495e63ff8---30225602816.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1a9da5e34---63282796605.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/93284277404.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dr7gccgvckapgu6dneg00db6j0/43466746100.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/75bd9c4f1f5cab4137fb8bd56df7e76a/dulelusadaduv.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c13a936df35c3eb2fc920e87cf083b33/tezoxawilijowilo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076d428a5f98---sunizafozoraporajida.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 11176 bytes
SHA-256: fa52b99df282d683af0c5b78d937826edb722f182b65b427204ee2d939ac8ea6
font_01_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 17316 bytes
SHA-256: e69344716e923320c29e00ae18793431ce949894c6e561bd58e5a7fda80a0205